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-rw-r--r--src/vu-set-alpha.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vu-set-alpha.c b/src/vu-set-alpha.c
index 423e8e9..5419d99 100644
--- a/src/vu-set-alpha.c
+++ b/src/vu-set-alpha.c
@@ -46,7 +46,7 @@ main(int argc, char *argv[])
struct stream alpha;
ssize_t r;
size_t i, n;
- void (*process)(struct stream *colour, struct stream *alpha, size_t n);
+ void (*process)(struct stream *colour, struct stream *alpha, size_t n) = NULL;
ARGBEGIN {
case 'i':